Porous CuO from Ag2Cu2Ox(x=3 or 4)Etched by CTAB for H2S Gas Sensing
Two nanoporous CuO skeleton structures were prepared based on the etching of Ag2Cu2Ox by CTAB and the dissolution of AgBr by sodium thiosulphate,the etching mechanism was further investigated using XRD,XPS and TEM.Tests showed that the CuO had unique morphology and large specific surface areas.H2S gas sensing experiments were carried out based on CuO with large pores and multiple sites.The sensors based on nano-CuO skeleton structures demonstrated the sensitivity of 1.7(CuO-Ag2Cu2O3)and 1.3(CuO-Ag2Cu2O4)for 0.0005％o H2S at a low temperature of 150 ℃.The response and recovery time of the sensors were short and a long-term stability was observed for the sensors.In the future,the performance could be further improved by constructing heterojunction or modifying porous copper oxide with noble metals.
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